COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES FLS Aerospace OA7 Optica Series Aeroplanes AD/OPTICA/6 Engine Control Linkage 8/97 Applicability: All Optica OA7 series aircraft. Requirement: 1. Inspect the 3/16 inch ball joints in the throttle and mixture linkage, forward and aft ends, for signs of wear in accordance with Paragraph 5 Part A of FLS Aerospace Mandatory SB B2/SB/007 Issue 2 dated 17/10/96. 2. Replace the ball joints in the throttle and mixture linkage in accordance with Paragraph 5 Part B of FLS Aerospace Mandatory SB B2/SB/007 Issue 2 dated 17/10/96. Note: UK CAA AD 009-10-96 refers. Compliance: 1. At next 50 hourly inspection after the effective date. Thereafter, reinspect at intervals not exceeding 50 hours time in service until Requirement 2 has been carried out. 2. Unless previously carried out, at next annual inspection. This airworthiness directive becomes effective on 17 July 1997. Background: The manufacturer has advised that during maintenance of an overseas aircraft the throttle arm was found to have been drilled oversize to accommodate a ¼ inch ball joint fitting.